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Test Bench Two Pro Sound Drivers and a Home Audio Midwoofer

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Test Bench Two Pro Sound Drivers and a Home Audio Midwoofer VOLUME 27, ISSUE 11 SEPTEMBER 2013 1 14 $ # %& &!"%'( 5 # # 27 "# 10 "##" ! N R M N R # # # # # # # # N EFE TRUEXTENTTRUEXTTRUEXRUEXTEXTENTNT TETTECHTECHC BRIBRIBRIEF TRUEXTENTTRUEXTTRUEX ENTTTE TETECHTECH BRBRIBRIBRIEFEF BeX™ Be40166 in RaRadian 950PB Compression Driver d Electro-Acous Extendedtende RangePeter J. Andrews, Beryllium Sr. Electro-Acoustics Engineer Dome Diaphragm ectively, one product. Recently, our customersmers have bbeen noticing the high performance of the Truextent Be4008 and Be4016 in the Radian 950PB compres- AssemblyAssem for Largeuropean Format dist Tuning Compression Forks:: Let YYour Ears Do Th e Math! sion driver. One EuropeanDrivers distributor has even decided to sell2 this combination as, eff 2 and Sam Saye 2 Th is Tech Brief willll compare compare, the Gordont performancePeter Simmons J. Andrews, of two Sr. diaphragms: Electro-Acousticstro-Acoust theic Truextent Engineer Be4016 and Radian’s 1245-16, both mounted in a 1, Peter Andrews MarshallRadian Buck 950PB-16 compression driver. All curves are taken in the Truextent Acoustic Test Chamber with the compression driver While many audiophileses and enginengineers are aware that beryllium is the lightest and stiff est metal for electro-acoustic transducers, it is mounted on a JBLL 2386 horn. Each diaphragm is driven with a 1Vrms sine chirp (log sweep), and the microphone is ~0.5m from the 1 Psychotechnology, Inc, Losm Angeles,perhaps CA not90034, easy USA to grasp asp the vast performancep advantages it has over other common ‘lightweight’ red, metals from a theoretical disc compression driverer throat.throat. SiSimilar results would be expected comparing 8-ohm versions. e beryllium diaphragm is shown in ussion like our white paper 1. For an easileasily audible demonstration, we machined three tuning ey show forks that to the exact same dimensions; one made of 2 Materion Electrofusion, Fremont, CA 94538, USA ’t First we show on-axis-axis frequenfrequency responses,aluminum, both one smoothed ) areof titanium,representativenium, (12th-octave) and onone of what of and beryllium. oneunsmoothed. might We see hope in Th published you had adatasheets. chance to ‘ping’Th these at a recent trade show demonstration. n blue. Th ee smoothed sm curves (left s the aluminum in s cover rough atter response in the critical 2-10kHz range (beryllium show Genuine Metal Matrixix both diaphragms cover roughly the same frequency range at roughly the same level. A casual observerProperties might even think there isn AlBeMet® Magnesium Titanitaniumium Aluminum much diff erence between the two except for the higher output and fl Beryllium Compositee Hz). ABSTRACT smoothing +3dB near 5kHz). Physical Properties Frequency Re Frequency Response; 1/12th-oct smoothed -Frequency Response; no 3 Density @ 25°C, g/cm 1.84 2.07 2.90 1.74 4.51 2.78 The development,de manufacture, and testing of a new large format compression driver diaphragm using a beryllium dome and new type of polymer surround is CTE @ 25°C, ppm/°C 11. 5 13.9 13.4 26.1 8.60 23.2 detailed that exhibits improved performance. This design promises to give long life ( and goodgo reliability with little or no change in performance anticipated over the life Thermal Conductivity @ 25°C, W/m·K 216 210 130 159 16.4 193 of the diaphragm. Design exercises include material properties comparisons, finite Y 0 1.925 elemenelement analysis, and modal simulations. A comprehensive set of tests of beryllium, 1.56 0.800 1.025 0.523 0.875 aluminaluminum, and titanium diaphragm compressionTh e first thing drivers you mightisight described noticenotice whenw including picking up the three forks is the diff erence in weight, with the titanium feeling much heavier in frequefrequency response, distortion, wavelet timeyour domain hands comparedanalysis don to a the 2 inchothotherer plane two. waveTitanium, of course, has a relatively high density, at 4.50g/cm3. Th e aluminum fork is defi nitely tube and laser scans of modes. Substantiallighter, differences at 2.70g/cm were3, and themeasured berylliumbery in fork theM even echanical lighter than P that,roperties only 1.85g/cm3. Th e actual masses of our example tuning forks are: perfoperformance categories, particularly in the frequency range above 4kHz. Aluminum Fork = uminum55.7 g (2.0 Fork oz.) UTS Ultimate Tensile Strength, MPa 370 435 570 196 344 186 Titanium Fork = 93.7tanium g (3.3 Fork oz.) = YS Yield Strength, MPa 240 321 480 105 275 75.8 Beryllium Fork = 38.5ryllium g (1.4 Fork oz.) = requency Young’s Modulus, GPa 303 193 140 44.0 105 73.1 1. INTRODUCTIONINTRO blue) Th e next thing you mightmight notice notice is is that the aluminum and titanium eforks aluminum ring at diaphragm nearly the (same pitch (roughly C5) when struck on a * Poisson’s Th e unsmoothedoothed curves curves (right) ( arehard a bit surface, harder but to thereade berylliuberyllium becausem of rinrings what at looksa much like higher noise, pitch or sharpR atio(roughly peaks E6). and dips,Even in though the high-f titanium is ~1.6x0.070 stiff- 0.180 er than 0.17 aluminum, it is 0.30 0.35 0.37 0.33 0.33 This paper presents a rationale for the use of beryllium as the material for the diaphragmred of) remains a smooth to over 20kHz, with dense modal f course, this is 1 high frequencyfrequ electroacousticregion. Of course, transducer. this is not noise, Thealso materialbut~1.7x rather heavier, properties densely giving packed essessentiallyof entialberyllium break-up the are modessame ccompared resonantSpeed of the diaphragm. offrequency Sound, inTh ,bothm/sec which materials. predicted ~2.4x higher 12,833 9,656 6,948 ows this behavio 5,029 4,82555,15,128 with aluminumalumi andclearly titanium shows thisand behaviorare found above to be~10kHz, superior is agrees whereas for with this thethe purpose. berylliumtheoretical diaphragmOther work donecomponents ( in our white paper of the assembly,asse break-up which is starting designed at arounaroundto retrofit 23kHz. many Th standard two inch exit compression drivers, ) are also addresseda onset for of break-up.improvements, such as the voice coil and the surround. Manufacturing processes are described, and reliability testing results are given. Comprehensive acoustic testing data on a terminatedWhile thetubehe frequency are presented responseresp comparing can be (and the usually three is) materials. smoothed Laser to hide scans this behavior,show modal the time-domain response (impulse response rer view of behavior of thegives three us diaphragms.a clearerclea view of what’s happening. ELECTROFUSION MATERION CORPORATION Truextent and AlBeMet are registered The above table contains typical typical values values TDS2011 06/2013 44036 South Grimmer Boulevard www.materion.com/electrofusion trademarks of Materion Brush Inc. from www.matweb.com for Beryllium,Beryllium, Fremont, CA 94538-6346 AlBeMet® AM162 rolled sheet, +1 510.661.9755 Magnesium annealed sheet, Aluminum MATERION CORPORATION 2. HISTORYHIST OF BERYLLIUM AS A DIAPHRAGM MATERIAL [email protected] 2024-O, and Titanium GradeGra de 2. 2. ELECTROFUSION www.materion.com/truextent 44036 South Grimmer Boulevard Beryllium is a rare and unique metal which is used in a Fremont,number CA 94538-6346of high technology industries including medical, aerospace, and high-energy physics. Applications+1 510.661.9755 for beryllium include x-ray componcomponents used in healthcare, scientific instruments [email protected] for advancing our understanding of the deedeepest laws of nature, satellite structures and aircraft components. ELECTROFUSION MATERION CORPORATION 44036 South Grimmer BoulevardBoul evard www.materion.com/truextent CopyrightCo © 2011 Materion Brush Inc. Fremont, CA 94538-6346 ® +1 510510.661.9755 661.9755 [email protected] pure power. Ultra low Distortion Cone Drivers Innovative driver solutions The ultra low distortion technology was developed by BMS after European fi nest quality drivers years of fundamental research and development focused on for professional and high-end the science of transducers and represents our commitment to technological excellence. loudspeaker applications The innovative design improves transient response for exceptional Worldwide largest manufacturer attack resulting in outstanding tight bass performance. of premium compression drivers Point Sources Coaxial compression Annular diaphragm Planar wave drivers drivers compression drivers for line arrays EUROPEAN HIGH QUALITY SPEAKERS BMS Speakers GmbH Hannover – Germany www.bmsspeakers.com VOICE COIL THE TEAM PUBLISHER: Hugo Van haecke ASSOCIATE PUBLISHER: Shannon Barraclough EDITOR: Vance Dickason CONTROLLER: Emily Struzik EDITORIAL COORDINATOR: C. J. Abate ART DIRECTOR: KC Prescott MANAGING EDITOR: Mary Wilson CUSTOMER SERVICE: Debbie Lavoie EDITORIAL ASSISTANT: Shannon Becker ADVERTISING COORDINATOR: Erica Fienman THE NETWORKS Tech the Future explores the solutions for a sustainable future provided by technology, creativity and science. OUR INTERNATIONAL TEAMS Wisse Hettinga Eduardo Corral Sunil D. Malekar +31 (0)46 4389428 +34 91 101 93 85 +91 9833168815 [email protected] [email protected] [email protected] Hugo Van haecke Maurizio del Corso Nataliya Melnikova +1 860-289-0800 +39 2.66504755 8 10 7 (965) 395 33 36 [email protected] [email protected] [email protected] !" Ferdinand te Walvaart Wisse Hettinga
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